Alert archive / Iowa / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 185

May 1, 200148 counties in Iowa; 24 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2001, 9:00 PM CDT for 48 counties in Iowa; 24 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2001, 9:00 PM CDT (02:00 UTC)
Expired
May 2, 2001, 3:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 72 counties

Adair County, IA, Allamakee County, IA, Audubon County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Mitchell County, IA, Monona County, IA, Montgomery County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 63 km from the middle of the area, began a volume at 02:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 1, 9:20 PM CDTSevere Thunderstorm WarningFSDDakota, Dixon25 min
May 1, 9:25 PM CDTSevere Thunderstorm WarningDMXCarroll40 min
May 1, 9:30 PM CDTSevere Thunderstorm WarningOAXCuming, Stanton30 min
May 1, 9:38 PM CDTSevere Thunderstorm WarningDMXCrawford32 min
May 1, 9:48 PM CDTSevere Thunderstorm WarningOAXCuming32 min
May 1, 10:04 PM CDTSevere Thunderstorm WarningDMXCarroll26 min
May 1, 10:11 PM CDTSevere Thunderstorm WarningOAXBurt, Dodge64 min
May 1, 10:23 PM CDTSevere Thunderstorm WarningOAXStanton47 min
May 1, 10:44 PM CDTSevere Thunderstorm WarningDMXCalhoun41 min
May 1, 10:48 PM CDTSevere Thunderstorm WarningDMXCarroll32 min
May 1, 10:50 PM CDTSevere Thunderstorm WarningOAXHarrison, Monona30 min
May 1, 10:55 PM CDTSevere Thunderstorm WarningOAXCuming35 min
May 1, 11:28 PM CDTSevere Thunderstorm WarningOAXThurston32 min
May 2, 12:39 AM CDTSevere Thunderstorm WarningFSDIda36 min
May 2, 1:50 AM CDTFlash Flood WarningDMXCalhoun, Sac3 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 63 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2001-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1236 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2001-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1236 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
2701 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

Nearby

Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Nebraska, 2001Every severe thunderstorm watch in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.